Valve.



A. F. MURPHY.'

VALVE.

APPLICATION FILED APR. Il. 1914.

Patented .1I uly 2, 1918.

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TllllllTMM @TdTEfa l .arr-nun r. MURPHY, or MONTREAL, armeno, canapa.

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latines.

To all whom t may concern:

Be it known that l, ALFRED Vl3`. MURPHY, a citizen of the United States of America, residing at the city of Montreal, in the Province of Quebec, and Dominion of Canada, have invented certain new and useful Improvements in Valves, of which the following `is av full, clear, and exactdescription.

- This invention relates to improvements in reducing valves, and the object is to provide a valve which may be adjusted to deliver a fluid at any `predetermined pressure, `regardless of the pressure of fluid supplied to the valve. Y

A further Aobject is V4to provide a valve which will operate automatically to control the admission `of fluid undervarying high pressure, so that the fluid will bedelivered from the valve at unvarying low pressure.

A still further object is to provide a valve which may be very readily adjusted to deliver fluid at any desired pressure.

Another object is to provide avalve which maybe positively closed without disturbing ythe adjustment thereof.

The invention consists :essentially of a body having inlet and outlet passages, and two plungers mounted at opposite ends of a rocking arm.y One of theseV plungers, located adjacent the inlet, is muchV smaller than the other and is arranged t0 control the admission of a high pressure fluid tothe pressure reducing passages. The other plunger is spring pressed to normally maintain the valve full open for j the entrance of high pressure fluid, but'is Vso much larger in area than the smaller plunger that the pressure of low pressure fluid thereon will move the sameto-operate the j small'plunger and regulate the admission of high pressure Huid. Means are provided -for regulating the constant load on the large plunger, and for positively operating the small plunger to entirely cut od the admission of high pressure fluid.

ln the drawings which illustrate the inventionz- Figure 1 is a vertical longitudinal sectional view of the valve.

Fig. 2 is a horizontal section on the line 2 2, Fig. 1. v

eferring more particularly to the drawings, 11 designates a body forming two cylindrical chambers 12 and 13 respectively arranged axially parallel. Inlet and outlet Specification of Letters Patent.

Patented duly 2,; 19112..

` Application ledApril 17, 1914. Serial 11o. 832,668. j

passages 14E and 15 are providedcommunicating respectively with. the chambers 12 and 13, which communicate in turn with one anotherthrough a'passage 16. v A hollow cylindrical member 17 ispositioned co-axially with the chamber k12,and is provided with a seat 18 surrounding an opening 19, which opening forms the only communication between the inlet `14:V vand chamber 12. A plurality of smallyradially disposed ports 20, are providedthrough, the wall of the member 17 above the seat 18s, the total area of said ports being preferably greater than the area of the aperture 19.

Aplunger 21 is mounted in the seat mem- AYloer 17 and is adapted 4to open and close the ports 2() upon reciprocation. This plunger diametrically slotted atits upper end in vertical and horizontal planes to forma socket 22 for the reception of one end of a rocking lever 23, pivoted intermediate its ends on a pin2l. The opposite .end of this lever engages a smaller socket25 1 formed in the stem 26 of a plunger 27'operating in the `chamber 13. The lower endoffthe 'spindle ends oscillate in the `vertical slots. f

, y The upper end of thechamber l12- is closed by a cap 32, through which a screw threaded spindle operates to regulate theimaximum rise of the plunger 21 or to hold the same positively down on its seat 18, and thus close the ports 20. The upper end of the chamber 13 is closed by a cap 34, within which a spring 35 of suitable strength is mounted. This spring is held in compression between the plunger 27 and a washer 36 mounted on the lower end of a spindle 37 operating in the cap. Suitable apertures 38 are provided in the cap 84 for the entrance and expulsion of air, so that movement of the plunger 27 will not be interfered with. 1t will thus be seen that the spring 35 operates to normally hold the plunger 27 down on its seat 39. lin order to render the plunger 27 fluid tight, a suitable number of rings 10 may be provided in thefcircumference thereof .bearing against the inner surface of the chamber. A

It will be readily seen .thatthe ,plunger 27 is much larger in'area than the plunger 21,

-ysmall I'pressure nunder the large plunger will still :balance a "high lpressure under. the small plunger.- The anountl of. pressure :required under the `-la-rge plunger may be regu- *latedbyV adjustingathe= compression ofthe spring 351 u I'-"llh'eoperation of the device isfex'trernely siinplea`1i`luid at high pressure enters the valve through thepassage 11i and; flows through the aperture 19,' and presses upwardly on the smallplunger '21 thus drawing ydown the :large plunger 27 with the assistanceof 4the spring 3'5. The fluid then flows through the ports 20, expands within theehamber 12, and ows through the passage 16 into lthe. chamber 13, and `out through they loutlet' passage 15. This expansion of the uid'causes a great reduction in the pressure.thereof.v The low pressure fluid flowing" into the chamber 13 presses up- V ward'l'y onl the plunger 2f? against the spring 35, and tendsto drivesame up and thus dcpress the plunger 21and close the `portsQO. grThe' compression of the spring 135 having 'been set-to deliver fluid at av certain pressure, forexample, ten pounds, willhold the plunger L27 stationary against a ten pound pressure. Ifthe lpressure -rises,the plunger will be forced `up, againstthe spring and thus depresses "the-` small plunger 21, so that less high pressure' fluid is admitted. If, however, the pressure-fallsbelovv ten lbs. the :springivvill/ depress Ythe large plunger, so

' Copies -ofthis patent @may be obtained vfor that Vvthesmall .plunger rises `and 4admits more high pressure fluid.

The advantages .of this valve are obvious, as when once set it will adjust itself to variations of the high pressure fluid and maintain a delivery7 of fluid at a uniform low pressure. The uses of such a valve are too numerous to be enumerated, but it may be stated that this valve has a particular advantage for steam heating, more particularly the heating of railway cars. lVhcn the train is nearing a .terminal point, the spindles 33 on the individual cars are screwed down, thus permanently closing the ports 20. The steam vin the coils willrepcatedly condense and drain back to the valve from where the Water of condensation may be removed through an automatic trap attached for cxaniple at 41. It will thus be seen that merel y cutting. olf the steam operates the drain automatically. If vit is found impossible to obtain a single spring suiliciently strong for all requirements, several springs may be used simultaneously, or conversely, if it is found that al single spring strong enough for the maximum requirements of the valve is too stiff for minimum requirements, the heavy spring may be readily exchanged for a lighter, or a number of 'springs used and one or more removed for low pressure use.

Having thus described my invention, what I claim is z- In a device of the character described, a body, a pair of plunger-s therein, crossshapedslots formed diametrically iu said `plungers, a rocking lever pivoted to the body and;having its ends I nojectiug into said slots and operable in the vertical arms ofthe slots, and lugs on the ends of said vlever engageable in the latter portions of said slots.

In Witness whereof, I have hereunto set my hand, in the `presence of two witnesses.

ALFRED F. MURPHY. Witnesses S. R. W. ALLEN, G. M.y MORELAND.

five 'cents each, by addressing the Commissioner of Patents.

Washington, '1). C. 

